This is almost the plot of Three Body Problem. Could we use a Solar Gravitational Lens in reverse and project signals out of the lens in reverse?
I think so, as long as you know how far away your target is (the focal point) to position the sender, and you need a way to send the signals at the right angles "skimming" the sun at the right distance. (note: armchair amateur, this is just conjecture / thought experiments)